Time
為什麼 Debian 沒有 time(1) 聯機幫助頁?
搜尋
time
命令的手冊頁不會產生任何結果(搜尋表單)。作為旁注,它似乎是 BASH 內置命令,因為
dpkg --search bin/time
找不到它。也許這樣的命令沒有自己的聯機幫助頁?
正確,通常 shell 內置程序有
help
頁面,因為它們的使用通常不涉及。如果內置命令都那麼複雜,那麼可能會努力通過將該功能推送到其自己的執行檔中來簡化 shell 邏輯,此時它將獲得一個手冊頁。
time
您可以通過使用獲取有關資訊help time
[jadavis6@ditirlns01 ~]$ help time time: time [-p] PIPELINE Execute PIPELINE and print a summary of the real time, user CPU time, and system CPU time spent executing PIPELINE when it terminates. The return status is the return status of PIPELINE. The `-p' option prints the timing summary in a slightly different format. This uses the value of the TIMEFORMAT variable as the output format. times: times Print the accumulated user and system times for processes run from the shell.
由於您的範例是
bash
GNU 工具,您還可以嘗試info <toolName>
獲取更詳盡的資訊。help
設計為在命令行上執行,並且他們不想淹沒您的螢幕(可能會將有用的資訊推送到螢幕外),因此他們會盡量保持help
簡短並在資訊頁面中為您提供完整的資訊。例如:[jadavis6@hypervisor ~]$ info time
<…按輸入鍵後,會出現一個 ncurses 頁面…>
File: time.info, Node: Top, Prev: (dir), Up: (dir) This file documents the the GNU `time' command for running programs and summarizing the system resources they use. This is edition 1.7, for version 1.7. * Menu: * Resource Measurement:: Measuring program resource use. -- The Detailed Node Listing -- Measuring Program Resource Use * Setting Format:: Selecting the information reported by `time'. * Format String:: The information `time' can report. * Redirecting:: Writing the information to a file. * Examples:: Examples of using `time'. * Accuracy:: Limitations on the accuracy of `time' output. * Invoking time:: Summary of the options to the `time' command. The Format String * Time Resources:: * Memory Resources:: * I/O Resources:: * Command Info::
完全描述資訊頁面可能超出了您的問題範圍,所以我將保留它。我只是提到它,以便您知道它們的存在。